125 entries under exact topic. ×

17
stiff(adjective, hard, severe, rough, difficult)
16
nice(noun, adjective, feature, correct, slight)
15
close(adjective, feature, correct, slight, harsh)
15
uncompromising(adjective, hard, severe, rough, difficult)
13
particular(noun, adjective, correct, fine, solid)
13
unerring(adjective, correct, solid, perfect)
12
faithful(noun, adjective, correct, right, appropriate)
12
punctual(adjective, correct, solid, proper)
12
right(noun, adjective, hard, complete, correct)
11
explicit(noun, adjective, correct, solid, perfect)
11
just(adjective, correct, right, appropriate, solid)
10
sharp(noun, adjective, correct, severe, harsh)
9
bitter(adjective, strong, hard, tough, severe)
9
oppressive(adjective, hard, tough, severe, rough)
9
pinpoint(adjective, strict, scrupulous, detailed)
8
inclement(adjective, hard, tough, severe, rough)
8
neat(adjective, strict, scrupulous, detailed)
8
rugged(adjective, strong, hard, tough, severe)
8
trustworthy(adjective, strict, scrupulous, detailed)
7
adjusted(adjective, strict, scrupulous, detailed)
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APASmart Define. (2016). rigorous thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rigorous/thesaurus/synonyms
ChicagoSmart Define. 2016. "rigorous thesaurus" https://smartdefine.org/rigorous/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, rigorous thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rigorous/thesaurus/synonyms>.
MLASmart Define. "rigorous thesaurus" 26 February 2016. Web. 22 September 2026. <https://smartdefine.org/rigorous/thesaurus/synonyms>